Printing is popular in a wide range, and there are many issues that need attention. According to the printing experience of industry professionals, here are nine difficult-to-print colors and some pre-press design considerations.
1. Gray balance. According to the experience of theory and production practice, the most difficult to control color of printed matter is gray balance. Gray balance means that the three primary colors of yellow, magenta, and cyan are combined and overprinted from light to dark according to a certain dot ratio to obtain achromatic achromatic (white, light gray, gray, dark gray, black) with different brightness under a certain printability. Obtaining a visually neutral gray color has many factors that affect it. The amount of ink used in printing, paper, full-page density, dot area, overprinting and the number of screen lines will all have inexhaustible effects on the gray balance. It is the most test of the overprint accuracy of the machine and the skill level of the operator.
2, 4-color screen and 3-color screen, do not print in full color (spot color printing is recommended).
3. The things designed by people who do not understand printing are the most difficult to print. Color is on the one hand, too much ultra-fine, ultra-small characters and so on.
4. For a large flat screen with C=50, M=50, Y=50, K=50, the color cast will be serious if there is a little inaccuracy.
5. The text is four-color, that is, there are text in the four colors in cmyk, especially the very small characters, which are difficult to put on, and the machine’s gripping teeth are extremely demanding. This is also a relatively common problem, so the pre-press designer must check whether the black text in the publication file, especially the small print, is only on the black plate, and should not appear on the other three-color plates. If it appears, the quality of the printed product will be greatly reduced. When the RGB graphics are converted to CMYK graphics, the black text will definitely become four-color black. Unless otherwise specified, it must be dealt with.
6. The black background is not easy to handle. In order to achieve the effect, the black background can be printed with special black ink or printed twice. It is not difficult to print, and it is more labor-intensive.
7. Superposition of several color dots, especially more than 70% dots. Specifically, dark brown, coffee, dark green (flat screen, containing blue 70), dark blue, purple blue, etc., are difficult to print because of the difference in color and it is not easy to find a balance on the printing machine.
8. In printing, things that are generally full-page, spot-color full-page or larger area, reversed white characters, the same logo, and the same color block, generally difficult to follow the color, easy to produce color difference, ghosting, smudge, scratch Injury phenomenon.
9. Small gold and silver text. Professionals say that small text is afraid of batch process drying. These must be controlled in place, the printing plate must be wiped clean, the ink viscosity must be controlled at around 14, and attention should be paid to the dry plate.
In short, qualified printed matter must meet the following requirements: 1. Accurate overprinting; 2. Uniform ink color; 3. Full dots; 4. Ink balance; 5. No printing faults, such as smearing, scratching, patterning, and paste printing; 6. , Strictly loyal to the original manuscript. We must pursue high-quality printed materials to adapt to people’s rising aesthetic concepts.